Class 13: Question 1

1. Class 13: Question 1 Which graph represents an object slowing down, where D is distance and t is time. Assume that units are the same for all four graphs A. B. C. D.

2. Class 13: Question 2 The speedometer in my car is broken. In order to find my average velocity on a trip from Los Angeles to San Francisco, I need • the total distance of the trip • the time spent traveling • the number of stops I made during the trip • a friend with a stopwatch • a working odometer • none of the above Select the best combination: • i, ii, & iii only • i & ii only • iv & v only • vi • a combination that is not listed here

3. Class 13: Question 3 The speedometer in my car is broken. In order to find my velocity at the instant I hit a speed trap, I need • the total distance of the trip • the time spent traveling • the number of stops I made during the trip • a friend with a stopwatch • a working odometer • none of the above Select the best combination: • i, ii, & iii only • i & ii only • iv & v only • vi • a combination that is not listed here

4. Class 13: Question 4 True or False: If a car is going 50 miles per hour at 2 pm and 60 miles per hour at 3 pm, then it travels between 50 and 60 miles during the hour between 2 pm and 3 pm. A. TRUE B. FALSE

5. Class 13: Question 5 True or False: If a car travels 80 miles between 2 and 4 pm, then its velocity is close to 40 mph at 2 pm. A.TRUE B. FALSE

6. Class 13: Question 6 True or False: If the time interval is short enough, then the average velocity of a car over the time interval and the instantaneous velocity at a time in the interval can be expected to be close. A.TRUE B. FALSE